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| <h2 id="_1">场景描述</h2> |
| <p>当微服务实例注册到服务中心后,微服务需要定时向服务中心发送心跳。若服务中心在一定时间内没有收到心跳信息,则会注销此实例。</p> |
| <h2 id="api">涉及API</h2> |
| <ul> |
| <li><code>org.apache.servicecomb.serviceregistry.client.ServiceRegistryClient</code>:服务中心客户端</li> |
| </ul> |
| <h2 id="_2">配置说明</h2> |
| <p><code>ServiceRegistryClient</code>提供了发送心跳的方法<code>heartbeat</code>,用户直接调用即可,示例代码如下:</p> |
| <pre><code class="language-java">public static void main(String[] args) throws Exception { |
| // 首先需要注册微服务和实例…… |
| // 发送心跳,不然实例会消失 |
| while (true) { |
| System.out.println("heartbeat sended:" + client.heartbeat(service2.getServiceId(), instance.getInstanceId())); |
| Thread.sleep(3000); |
| } |
| } |
| </code></pre> |
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